The result continues the United States' exceptional pre-World Cup form, in which it has won seven matches in a row, scoring 36 goals.
"If this is 10-0 in a men's World Cup are we getting the same questions?" she asked. How could they rejoice at scoring goals on an global stage while playing at the highest level possible?
Thailand, ranked 34th in the world, lost 9-0 in their previous meeting with the US in a friendly in 2016 and were playing in the finals for only the second time.
Defenders of the pay gap pointed to the significantly higher revenue generated by the men's World Cup, compared with the women's event.
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Tennis legend Billie Jean King weighed in: "The pursuit of a record 4th World Cup trophy for the #USWNT officially begins today, but the journey has been years in the making".
Horan smashed in the third in the 32nd minute, but the floodgates really opened in the second half as Jill Ellis's side scored four times in six minutes shortly after the restart. They're also calling on other countries to invest more in women's soccer and urging Thai players like Miranda Nild not to give up.
Thailand, ranked No. 34 in the world, was clearly outmatched even though the team has shown progress on the world stage.
The United States faces Sweden in the final game of the group stage next week.
What: The U.S. Women's National Team will take on Thailand in Group F play at the 2019 FIFA Women's World Cup. The US were 3-0 up, with goals coming from Alex Morgan, Lindsey Horan and Rose Lavelle, but eight goals (nine to break the record) in 45 minutes seemed scarcely possible. It wasn't just the United States exploiting a weaker team, it was tactical attacks, respect for Thailand as a team and the desire to hoist the Word Cup again, which is why Carli Lloyd and Christen Press made their first appearances of the tournament in the 57th minute.
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The scoring started early and didn't let up with the stars of Team USA keeping the pressure until the final minute. And if you can play as many hot as you possibly can, feeling good, feeling the back of the net, that's so important for a forward and for a midfielder. "We knew every goal could matter".
"Celebrating goals later in the game like this is just completely unnecessary".
Thailand are not the only side facing up to the American behemoth.
"A lot of this is about building momentum and so as a coach I don't find it my job to rein my players in", Ellis told The Wall Street Journal.
Goal difference may be important in deciding who wins the group, with the U.S. facing Chile next before taking on Sweden, the team who defeated them in the quarter-finals of the Rio Olympics in 2016.
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Formula One driver Lewis Hamilton and boxer Anthony Joshua (both at $US55 million) were the highest-earning British athletes. LeBron James earned $89m in total with Stephen Curry having made $79.8m and Kevin Durant $65.4m.